power-on self-test
The checks a computer's firmware runs on its hardware when it is switched on, before any boot loader starts.
In more detail
A failure is reported with beep codes, lights or a message, and the machine never reaches GRUB. Faulty memory and missing devices are common causes.
Related terms
- firmware — Low-level software built into a device's hardware that starts it and controls its basic functions.
Taught in
- You Are In Emergency Mode: Boot Failures From GRUB To fstab, On Both Families — CompTIA Linux+ (XK0-006) Exam Prep